The way we produce leather

 

(57) Abstract:

The inventive wet-blue doublenaut chrome tanning agent, to neutralize the waste after retanning tub, color in the presence of an aqueous solution of ammonia in quantities of 1 to 2% by weight of shaved leather, doublenaut synthetic tanning agent based resins when the consumption of 2 to 3% by weight of shaved leather for 30 to 40 minutes, doublenaut organic tanning agent, conduct gidrofobiziruyuschey greasing and processing of organic acid, re-doublenaut chrome tanning agent and dried. Spend two Taiko, a breakdown in the dryer, put a layer of coating paint and fix. Conduct additional breakdown in the drum within 4 to 6, the drying and pressing. table 1.

The invention relates to chemical treatment of skins, in particular, to methods for production of special kinds of skin and can be used in the formulation of skins for clothing.

A known method of manufacture of leathers, including: soaking off, liming, glutton liming at the rate of hydrate of calcium oxide 0.3 to 0.5% by weight of the hide, obessolivanie, abating at a flow rate of protocolin of 0.5-0.6% by weight of the hide, pickling, tanning, shaving, tanning retanning connection is,8-2,2% by weight of shaved leather, counting on tanning, additional retanning synthetic tanning agent, dyeing, the first phase of fatliquoring, the second phase of fatliquoring, retanning organic tanning agent, drying and finishing by two serious breakdown in the drum within 4-6 h, double coating layers coating paint with intermediate pressing and double fastening with intermediate second pressing [1]

The prototype of the proposed technical solution is the way to making skins, including retanning chrome tanning agent, washing, neutralization, dyeing, retanning organic tanning agent, greasing, processing organic acid, re-retanning chrome tanning agent, drying, triple Taiko with intermediate podarkami, a breakdown in the drum within 6-10 h, applying a layer of non-pigmented primer, two coats of finishing paint with intermediate pressing, applying a layer of a contrasting coating, the second pressing and pinning [2]

A disadvantage of known methods is that they do not provide a soft supple leather for garments from raw cattle increased weighing.

The objective of the invention is to improve the quality caņa chrome tanning agent, neutralization, dyeing, retanning organic tanning agent, gidrofobiziruyuschey greasing, processing organic acid, re-retanning chrome tanning agent, drying, double Taiko, a breakdown in the drum, applying a layer of coating paint, pressing and pinning, the neutralization is carried out on the waste after retanning chrome tanning agent bath, the dyeing is carried out in the presence of aqueous ammonia in the amount of 1-2% by weight of shaved leather, before doublepane organic tanning agent additionally produce retanning synthetic tanning agent based resins when the rate of 2-3% by weight of shaved leather for 30-40 min, after fastening produce additional breakdown of the skin for 4-6 h, and drying and pressing is carried out after additional drying.

A distinctive feature of the proposed method is that neutralised to waste after chrome retanning bath, the dyeing in the presence of an aqueous solution of ammonia, additional retanning synthetic tanning agent based resin, a further breakdown and drying, followed by pressing, allow to obtain elastic soft leather for clothing with in the whether an aqueous solution of ammonia at less than 1% when the dyeing is not possible to obtain a strongly colored skin, using its more than 2% creates an increased pH of the dye solution, which reduces the depth of penetration of the dye into the skin. An additional retanning synthetic tanning agent based resin at a flow rate less 2% less than 30 minutes does not allow the skin with high performance properties and the conduct of the specified process at a rate higher than 3% over 40 min increases the stiffness of the leather. When conducting additional breakdown less than 4 h reduced the softness and elasticity of the skin. Its more than 6 hours is impractical because it does not lead to further increase softness.

The technology of the method is as follows.

Otlochno-ash, and left lying tanning processes and operations performed by a typical method of producing leather chrome tanning of different thicknesses and a range of upper and Shoe lining from the skins of cattle. After planing of skin thickness 0,6-0,8 mm they are washed for 15-20 min at a temperature of 40-45aboutWith, doublenaut chrome tanning agent at a flow rate of 4-5% by weight of shaved leather, considering the physical weight, within 50-60 min and neutralized to waste after retanning bath for 30-40 min 1,0-1,2% of sodium formiate, then for 30-40 min nie when W. K. 1,5-2,0, temperature 40-45aboutWith consumption and dyes 1,5-2,0, a temperature of 40-45aboutWith consumption and dyes of 1.5-2.0% by weight of shaved leather in the presence of 1-2% ammonia. After 25-30 minutes in the same bath add 2-3% synthetic tanning agent based resins, processing time 30-40 minutes Then in the same tub produce retanning with a mixture of organic tanning agent for 40-45 minutes the Bath is drained and implement gidrofobiziruyuschey greasing at a temperature of 50-55aboutWith and W.to. of 1.5-2.0, which initially leather handle greasing emulsion for 50-60 min, and then in the same bath water-repellent material for 50-60 minutes After that, the drum type of 0.3-0.4% organic acid, diluted with water 1 to 10, and after 20-30 min re-produce retanning chrome tanning agent for 50-60 min at the flow rate of 2.0-2.5% considering the physical weight. Then the skin is subjected to washing at a temperature of 23-25aboutWith, the hides are not less than 6 hours, drying in a free state to a moisture content of 18-20% two taike, the breakdown in the drum within 6-8 hours, drying in the dryer frame for 10-16 minutes to a moisture content of 14-16% and finish by applying a layer of coating paint, fixing, additional breakdown in the drum for 4-6 h and drying in the dryer frame is built from raw materials byczyna light in accordance with the standard method of production of leather, chrome tanning of different thicknesses and a range of upper and Shoe lining from the skins of cattle, planning to a thickness of 0.6-0.8 mm, was washed at a temperature of 40aboutC for 15 min and doubleval chrome tanning agent at W.to. 1, the temperature of the 40aboutWith consumption and tanning agent 5% by weight of shaved leather, considering the physical weight, for 1 h and Then in the same tub made neutralization during the first 30 min 1% of sodium formate, and then for 30 min with 1.5% sodium bicarbonate. After washing at a temperature of 45aboutC for 15 min skin was filed on dyeing with W.to. 1.5 and a temperature of 45aboutWith what the drum was first introduced 25% aqueous ammonia solution in the amount of 1.0% by weight of shaved leather, and then after 5 min the dye at the rate of 2% by weight of shaved leather. After 30 minutes in the same bath was added 2% of the tanning agent Relugan RE and after another 30 min 4% tanning agent BOPD and 2% of an extract of willow, counting on tanning, cannedy. The duration of processing organic tanning agent 45 minutes and Then the bath was poured and produced greasing at W.to. 2 and a temperature of 50aboutC for 60 min following composition, by weight shaved skin: Lipsol ES 3% Lipsol BSFR 6% pasta VNIIG 4% Then in the same bath was added hydrophobic material Perfecta UKB in the amount of 7% of the processing time of 60 minutes Then the drum was injected with 0.4% formic acid, diluted iterature 25aboutC for 10 min, was subjected to aging for 6 hours, dried in a free state to a moisture content of 18-20% two taike, the breakdown in the drum for 8 h and drying with a banner on the frame of the dryer for 16 min to a moisture content of 14-16% Then the leather was applied the finishing of the following composition, wt. including pigment concentrate of 8.25, Rubbers EN 3925 50, Filler Fi 1261 15, emulsion of BMP-3 (40%) 25 water 75. Fixation was carried out in the following composition, wt.h. microemulsions lacquer 5183 500, butyl acetate 500, Xeroderm SA 43059 (4%) 100. After that produced additional breakdown in the drum for 4 h and drying stretch on the frame of the dryer for 16 minutes Pressing of the skins was carried out in a vacuum dryer "income".

P R I m m e R 2. Leather obtained by standard methods from raw materials byczyna easy, after planing to thickness of 0.6-0.8 mm were processed as in example 1, but the dyeing was carried out in the presence of 1.5% ammonia, then for 35 min was carried out for more retanning tanning agent DDM-2C in the amount of 2.5% by weight of shaved leather, and additional breakdown produced during the 5 o'clock

P R I m e R 3. Leather obtained from raw materials of byczyna heavy on the type method, after planing to thickness of 0.6-0.8 mm were processed as in premiumline Relugan RE in the amount of 3% by weight of shaved leather, and additional breakdown produced within 6 hours

P R I m e R 4. Leather obtained from raw materials of byczyna light in accordance with the standard method, after planing to thickness of 0.6-0.8 mm, was treated as in example 1, but the dyeing was carried out in the presence of 0.5% ammonia, then for 20 min was carried out for more retanning tanning agent DDM-2C in the amount of 1.5% by weight of shaved leather, and additional breakdown produced within 3.5 h

P R I m e R 5. Leather obtained by standard methods from the skins of byczyna heavy, after planing to thickness of 0.6-0.8 mm were processed as in example 1, but the dyeing was carried out in the presence of 2.5% ammonia, and then for 50 min was carried out for more retanning Relugan RE in the amount of 3.5% by weight of shaved leather, and additional breakdown produced in the course of 6.5 hours

As a result of all five examples were obtained finished leather for garments, which had the figures shown in the table.

The use of the proposed method will allow you to get a skin for clothes with high performance properties of the raw materials of cattle increased weighing.

The METHOD of manufacture of LEATHERS, including retanning their chrome tanning agent, neutrally acid, re retanning chrome tanning agent, drying, double Taiko, a breakdown in the drum, applying a layer of coating paint, pressing and fixing, wherein the neutralization is carried out on the waste after retanning chrome tanning agent bath, the dyeing is carried out in the presence of an aqueous solution of ammonia in quantities of 1 to 2% by weight of shaved leather, before doublepane organic tanning agent additionally produce retanning synthetic tanning agent based resins when the consumption of 2 to 3% by weight of shaved leather for 30 to 40 minutes, after fastening produce additional breakdown of the skin within 4 to 6 hours, and drying, and pressing is carried out after additional drying.

 

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Method of finishing // 2017825

FIELD: leather industry.

SUBSTANCE: semifinished product is degreased, neutralized, dyed, and lubricated. Dyeing is performed in two washing-interrupted steps with anionic black dye consumed in amount 0.5-0.6% of the weight of semifinished product in each dyeing step. Lubrication is followed by retannage with chrome tanner in amount 0.6-1.0% of the weight of semifinished product (calculated for chromium oxide) and treatment with 0.8-1.0% of spindle oil.

EFFECT: achieved deep black color and high performance characteristics.

1 tbl, 5 ex

FIELD: light industry.

SUBSTANCE: powdered thermoplastic polyurethane with reduced melting point is applied on fur article parts in most wear place, said polyurethane being prepared from 4,4-diphenylmethanediisocyanate, poly(butylene glycol adipate) and 1,4-butanediol serving as chain extension agent. Thus treated part is then pressed at 64-75°C and remained to lie.

EFFECT: improved quality of fur articles due to increased hair-to-skin tissue binding strength, resistance of hair coat against wear, and increased lifetime of clothes.

FIELD: leather industry.

SUBSTANCE: invention relates to finishing of various-destination leathers made from various types of raw skins and consists in consecutively applying layers of soaking ground, covering paint, and fixing agent. After applying each layer, leather is dried for 5 to 50 sec in microwave fields at field intensity 10000-15000 v/m and power 300-3500 W.

EFFECT: expanded technological possibilities and improved quality of coating.

1 tbl, 5 ex

FIELD: tanning industry.

SUBSTANCE: process is conducted in vertical mill to which soot, induline, kerosene and diesel fuel are introduced. Then components are mixed and slow heating the apparatus and its content is started after which mixing is switched off and slow heating of mill content is continued. Upon expiration of said time, acids or their compositions, white spirit and fatty additive are introduced and chemical mass-exchange process is performed at spontaneously fixed temperature due to thermal effects of this process and natural cooling at the beginning and at the end, as well as due to forced cooling at intermediate stage characterized by high rates of temperature at maximum of 140-150°C. At the moment when forced cooling is discontinued, 0.5-1.5 h before discontinuation of mixing and beginning of withdrawal at temperature of 80-115°C, 43-52-% solution of aluminum salts and C10-C20 of carboxylic acids is introduced into product being prepared.

EFFECT: facilitated procedure; increased amount of product.

1 tbl, 15 ex

FIELD: light industry; methods of forming of volumetric and curvilinear details for an article.

SUBSTANCE: the invention is pertaining to the field of light industry, in particular, to the methods of forming of volumetric and curvilinear details for an article is intended for usage in light industry at forming volumetric and curvilinear details for articles made out of a leather, predominantly - clothing. The method consists that on the surface of the flesh side of hide of the flat component of the article made out of leather deposit the polymeric composition containing the following elements (in mass %): - polyvinyl acetate homopolymeric coarse-dispersed plasticized dispersion - 20-35; - dibutyl phthalate (DPHT) - 1.5-15; - water - the rest. The composition may be deposited in the form of a net on in advance prepared templates. After that the component of the article is dried at an indoor temperature. Then the component of the article is formed, for example, by hot pressing at 70-90°C during 1.5-2.0 minutes. And fix the gained form by chilling. The invention ensures improvement of quality of the articles made out of leather due to increased the form stability of components of the article.

EFFECT: the invention ensures improvement of quality of the articles made out of leather due to increased the form stability of components of the article.

4 cl

FIELD: leather industry.

SUBSTANCE: preparation of composition is conducted on vertical-type bead mill. Induline, kerosene, and diesel fuel are consecutively charged into mill before stirring mechanism is energized, after which apparatus and contents thereof are slowly heated. Stirring is then stopped for 1 h while slow heating of mill contents is continued. When specified time expires, carboxylic acid or acid mixture, white spirit, fat additive, and aluminum oxide or hydroxide are added. Mechanic stirring is then switched on and contents of the bead mill are ground and the process is carried out at spontaneously fixed temperature caused by heat effects of the processes and natural cooling. When temperature is lowered to 85-120°C, desired product is discharged.

EFFECT: simplified process and increased product discharge degree.

1 tbl, 19 ex

FIELD: leather industry.

SUBSTANCE: invention relates to wax emulsions used in coating pain composition designed for finishing genuine leathers and provides a wax emulsion component, which represents polyvinylacetate dispersion containing non-plasticized polyvinylacetate in amount at least 45 wt %, content of polyvinylacetate dispersion in wax emulsion ranging from 40 to 80%. Proposed component when used in wax emulsion allows leather coatings to be obtained manifesting good organoleptic properties, high temperature resistance, low tackiness, and agreeable leather to the touch at moderate cost of wax emulsion.

EFFECT: improved consumer's quality and enlarged resource of wax emulsion components.

1 tbl, 6 ex

FIELD: leather industry.

SUBSTANCE: method, which is suitable for finishing chrome leathers, comprises consecutively applying coating layers followed by action with low-temperature plasma at generator lamp anodic current intensity 0.2-0.6 A. Action of low-temperature plasma is effected for 180-240 sec at pressure 13.3-26.6 Pa in discharge chamber and consumption of plasma-forming gas (argon) 0.035-0.04 g/sec. Method is implemented on high-frequency plasma installation.

EFFECT: increased adhesion of coating to dry and wet leather, dye penetration depth, resistance to repetitive bends, and strength at better quality of leather.

FIELD: process engineering.

SUBSTANCE: proposed method comprises eliminating defects representing damages sports (3) in layers (2) formed by recesses in skin (1) with natural grain patter. These defects are eliminated as follows, i.e. water or slightly foamed plastic suspension is forced into aforesaid recesses, the said suspension containing ultimate solid particles. Then skin (1) is dried, surface (4) of the layer of grain pattern (2) is subjected to pressure and thermal treatment with the help of pressure roller at least 100°C. Note here that plastic mass is formed in aforesaid recesses that contains hollow tiny balloons (5) made up of solid particles to completely fill the said recesses (dwg. 1).

EFFECT: higher quality.

13 cl, 1 dwg, 1 ex

FIELD: process engineering.

SUBSTANCE: all layers of undercoat and finish paint are applied on leather subjected, prior to drum painting, to low-temperature non-equilibrium plasma of high-frequency discharge. Exposure is performed for 241 to 280 seconds in discharge chamber at 26.7 to 30.0 Pa, flow rate of plasma-forming argon making 0.041 to 0.06 g/s at discharge power of 0.7 to 2 kW.

EFFECT: increased depth of paint penetration, improved quality of ready leather.

1 dwg, 1 tbl

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